JP2018105328A - Slide type constant velocity universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide-type constant velocity universal joint capable of preventing excessive increase of an amount of grease (lubricant) by suppressing increase of a joint inner volume, and not affecting durability in a use range in driving a vehicle after assembled in the vehicle and the like.SOLUTION: In a slide-type constant velocity universal joint, an internal component is assembled in a state that the internal component is slid to a joint depth side once, and then slid to a joint opening side. An outer joint member has a sealing device for sealing an opening portion, and a grease injection port for injecting grease into the joint in a state of sliding the internal component to the joint opening side, is formed on at least any of the sealing device and the outer joint member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sliding type constant velocity universal joint used for automobiles, industrial machines and the like.

  Constant velocity universal joints are roughly classified into fixed constant velocity universal joints that allow only angular displacement and sliding constant velocity universal joints that allow angular displacement and axial displacement. The fixed type constant velocity universal joint and the sliding type constant velocity universal joint are used for a propeller shaft, a drive shaft, and the like.

  The propeller shaft includes a fixed type constant velocity universal joint, a sliding type constant velocity universal joint, and an intermediate shaft connecting these constant velocity universal joints. When assembling such a propeller shaft in a vehicle (automobile), the sliding type constant velocity universal joint is temporarily compressed (the shaft is pressed into the outer joint member inside the sliding type constant velocity universal joint) Reduce the overall length of the propeller shaft. Thereafter, the outer joint member of the sliding type constant velocity universal joint is fastened to the mating flange portion of the part to be assembled, and the propeller shaft is extended and fastened to the other mating flange portion.

  However, the sliding type constant velocity universal joint has a small gap between internal parts (parts composed of an inner joint member and a torque transmission member), and therefore, the lubricating grease inside the joint is difficult to flow. Therefore, conventionally, a sliding type constant velocity universal joint having a configuration capable of reducing sliding resistance during compression / extension has been proposed (Patent Document 1).

  The sliding type constant velocity universal joint described in Patent Document 1 is provided with a communication groove for lubricant flow in the axial direction between the guide grooves of the outer joint member. That is, when assembled in an automobile, the lubricant accumulated at the bottom of the outer joint member is likely to flow to the opposite side of the inner joint member through this communication groove, and the length dimension of the propeller shaft or the like can be sufficiently compressed. Is.

JP 2006-266330 A

  In the constant velocity universal joint shown in Patent Document 1, a communication groove that promotes the flow of grease (lubricant) is formed in the operating range. For this reason, the contact length (contact area) between the inner diameter surface of the outer joint member and the outer spherical surface of the cage decreases, resulting in an increase in surface pressure. Further, during rotation, the communication groove edge on the inner diameter surface of the outer joint member comes into contact with the outer spherical surface of the cage. For this reason, wear of both members (the outer joint member and the cage) occurs. Therefore, in the case where the communication groove is provided as described in Patent Document 1, there is a possibility that the durability as a constant velocity universal joint may be adversely affected.

  Furthermore, by providing the groove in the entire slidable region, the volume of the joint increases and the amount of grease used increases. In addition, the processing range (processing length) of the groove is long, resulting in high costs.

  Therefore, in view of the above problems, the present invention can suppress an increase in the internal volume of the joint and prevent an excessive increase in the amount of grease (lubricant) on the premise that the sliding resistance during assembling work is reduced. In addition, the present invention provides a sliding type constant velocity universal joint that does not affect the durability in the range of use when the vehicle is operated after being assembled to the vehicle or the like.

  The sliding type constant velocity universal joint of the present invention includes an outer joint member, an inner joint member, and a torque transmission member interposed between the outer joint member and the inner joint member, and the inner joint member and the torque transmission member. The inner part is housed in the outer joint member so as to be able to slide in the axial direction. After sliding the inner part once to the inner side of the joint, the inner part is slid to the joint opening side and assembled. Type constant velocity universal joint, having a sealing device for sealing the opening in the outer joint member, and at least one of the sealing device and the outer joint member with the internal part slid to the joint opening side, It is provided with a grease injection port through which grease is injected.

  According to the sliding type constant velocity universal joint of the present invention, grease is injected into the inside of the joint through the grease inlet when the internal part is slid to the joint opening side (assembled state). The amount of grease inside the joint can be reduced or not injected. For this reason, the grease flow resistance can be reduced or reduced when the inner part is pushed into the outer joint member at the back side during the assembling work and when the inner part is pulled out to the outer joint member opening side. Can be reduced.

  The sealing device includes a metal adapter attached to the opening of the outer joint member and a flexible boot attached to the metal adapter, and the metal adapter is provided with a grease inlet. Alternatively, the outer joint member may be provided with a grease inlet.

  The grease inlet is preferably closed with a plug member. If the grease injection port is blocked by the plug member, it is possible to prevent the grease from flowing out from the grease injection port during use.

  As a sliding type constant velocity universal joint, the outer joint member has a track groove formed on the inner diameter surface, the inner joint member has a track groove formed on the outer diameter surface, and the outer joint member track groove and the inner joint member track groove The torque transmission member interposed between the two is a ball, has a pocket for accommodating the ball, and includes a cage interposed between the outer joint member and the inner joint member. A double offset type in which the center of curvature of the inner peripheral surface is offset in the axial direction opposite to the angle center of the joint can be provided.

  As a sliding constant velocity universal joint, the inner joint member alternately forms track grooves inclined in opposite directions with respect to the axis on the outer peripheral surface in the circumferential direction, and the outer joint member is formed on the inner peripheral surface with respect to the axis. Torque transmission balls as torque transmission members formed by alternately forming track grooves inclined in opposite directions in the circumferential direction, and incorporating them at the intersections of the track grooves of the pair of inner joint members and the track grooves of the outer joint members, respectively. And a cross-glove type comprising a cage having a window portion interposed between an outer peripheral surface of the inner joint member and an inner peripheral surface of the outer joint member and holding the torque transmission balls at a predetermined interval in the circumferential direction; can do.

  As a sliding type constant velocity universal joint, the outer joint member is formed of three track grooves having roller guide surfaces facing in the circumferential direction, and a tripod as an inner joint member having three leg shafts projecting in the radial direction. A tripod type including a member and a roller as torque transmitting means that is rotatably fitted to the leg shaft via rollers can be provided.

  In the present invention, the sliding resistance during the assembling work can be reduced, and this assembling workability can be improved. In addition, the edge on which the internal part slides is not formed on the inner diameter surface of the outer joint member, so that wear between the internal part and the outer joint member can be prevented, and a sliding constant velocity universal joint having excellent durability can be configured. Further, there is no need to provide a groove or the like on the inner diameter surface of the outer joint member, the increase in the inner volume of the joint can be prevented, the amount of grease used can be minimized, and the cost can be reduced.

1 is a cross-sectional view of a constant velocity universal joint according to the present invention, which is a constant velocity universal joint in which a grease inlet is provided in a sealing device. FIG. 2 is a simplified diagram showing a method of assembling a propeller shaft, which is a power transmission structure using the sliding constant velocity universal joint shown in FIG. 1, to a vehicle. FIG. 3 is a simplified diagram showing an assembled state of the propeller shaft shown in FIG. 2 to a vehicle. FIG. 3 is a cross-sectional view of the constant velocity universal joint according to the present invention, wherein the grease injection port is provided in the outer joint member. It is sectional drawing of the state which has plugged up the grease injection opening of the sliding type constant velocity universal joint shown in FIG. It is sectional drawing of a cross glove type sliding type constant velocity universal joint. FIG. 7 is a development view of a track groove (ball groove) of the sliding type constant velocity universal joint shown in FIG. 6. It is a longitudinal cross-sectional view of a tripod type sliding constant velocity universal joint. It is a cross-sectional view of a tripod type sliding constant velocity universal joint.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 2 shows a propeller shaft which is a power transmission structure using a sliding constant velocity universal joint according to the present invention. A fixed type constant velocity universal joint 1, a sliding type constant velocity universal joint 2, and a shaft S for connecting these constant velocity universal joints are provided. In this example, a Barfield type constant velocity universal joint is used as the fixed type constant velocity universal joint, and a double offset type constant velocity universal joint is used as the sliding type constant velocity universal joint.

  The fixed type constant velocity universal joint 1 includes an outer joint member 5 in which a plurality of track grooves 3 extending in the axial direction are formed on the inner diameter surface 4, and a plurality of track grooves 6 extending in the axial direction are formed on the outer diameter surface 7. Inner joint member 8, a plurality of balls 9 interposed between track grooves 3 of outer joint member 5 and track grooves 6 of inner joint member 8 and transmitting torque, inner diameter surface 4 and inner side of outer joint member 5 A cage 10 is provided between the outer diameter surface 7 of the joint member 8 and holds the ball 9.

  The sliding type constant velocity universal joint 2 includes an outer joint member 33 in which track grooves 32 extending in the axial direction are formed in a cylindrical inner diameter surface 31 at equal intervals in the circumferential direction, and a spherical outer diameter surface 34 in the axial direction. And a ball 37 interposed between the track groove 32 of the outer joint member 33 and the track groove 35 of the inner joint member 36 which form a pair. Between the outer joint member 33 and the inner joint member 36. The cage 38 is interposed between the inner diameter surface 31 of the outer joint member 33 and the outer diameter surface 34 of the inner joint member 36. This is a double offset type constant velocity universal joint capable of not only angular displacement but also axial displacement. That is, as shown in FIG. 1, the center of curvature O1 of the outer peripheral surface 38a of the cage 38 and the center of curvature O2 of the inner peripheral surface 38b are offset in the axial direction opposite to the angular center O of the joint.

  As shown in FIG. 2, the shaft S includes a central large-diameter cylinder 11 and shaft members 12 (12 </ b> A and 12 </ b> B) that are connected to both ends of the cylinder 11. The shaft member 12 </ b> A includes a boss portion 13 that is fixed to the cylindrical body 11 and a main body shaft portion 14 that protrudes from the boss portion 13. In this case, the boss portion 13 includes a large-diameter portion 13a and a small-diameter portion 13b. The large-diameter portion 13a is formed with a circumferential cutout portion 13a1, and one open end portion 11a of the cylindrical body 11 is fitted. ing. In this fitted state, one open end 11a and the large diameter portion 13a of the cylindrical body 11 are joined and integrated by welding or the like.

  A male spline 14 a is provided at the end of the main body shaft portion 14 on the opposite boss side, and a boot mounting portion 15 to which a boot of a sealing device 18 described later is mounted is provided at an axial intermediate portion of the main body shaft portion 14. ing. The boot mounting portion 15 is provided with a circumferential groove 15a.

  A female spline 8 a is provided on the inner diameter surface of the shaft center hole of the inner joint member 8 of the fixed type constant velocity universal joint 1. For this reason, the male spline 14a of one shaft member 12A of the shaft S is fitted into the axial hole of the inner joint member 8, and the male spline 14a and the female spline 8a are fitted. Further, a circumferential groove is formed at the end of the male spline 14a, and a retaining ring 16 for preventing the shaft from falling off is attached to the circumferential groove.

  An end plate 17 is attached to one opening of the outer joint member 5 (on the anti-sliding constant velocity universal joint side), and a sealing device 18 is attached to the other opening of the outer joint member 5. ing. The sealing device 18 includes a metal adapter 19 and a rubber or resin boot 20. That is, the metal adapter 19 includes a main body cylinder portion 19a that is fitted and fixed to the other opening of the outer joint member 5, and a sliding constant velocity universal joint side from the main body cylinder portion 19a via the stepped portion 19b. And a boot mounting portion 19c projecting toward the top.

  The boot 20 includes a large end 20a, a small end 20b, and a V-shaped or U-shaped folded portion 20c that connects the small end 20b and the large end 20a. And the small end part 20b of the boot 20 is externally fitted by the boot mounting part 15 of 12 A of shaft members, and is fastened by the boot band externally fitted by this small end part 20b. Further, the large end portion 20 a of the boot 20 is held by crimping the boot mounting portion 19 c of the metal adapter 19.

  The other shaft member 12 </ b> B also has a boss portion 23 fixed to the cylindrical body 11 and a main body shaft portion 24 protruding from the boss portion 23. In this case, the boss portion 23 is composed of a large diameter portion 23a and a small diameter portion 23b. A circumferential cutout portion 23a1 is formed in the large diameter portion 23a, and one open end portion 11b of the cylindrical body 11 is fitted. ing. In this fitted state, one open end portion 11b of the cylindrical body 11 and the large diameter portion 23a are joined and integrated by welding or the like.

  A male spline 24a is provided at an end of the main body shaft portion 24 on the opposite boss side, and a boot mounting portion 25 to which a boot of a sealing device to be described later is mounted is provided at an axial intermediate portion of the main body shaft portion 24. Yes. The boot mounting portion 25 is provided with a circumferential groove 25a.

  A female spline 36 a is provided on the inner diameter surface of the shaft hole of the inner joint member 36 of the sliding type constant velocity universal joint 2. For this reason, the male spline 24a of one shaft member 12B of the shaft S is fitted into the axial hole of the inner joint member 36, and the male spline 24a and the female spline 36a are fitted. Further, a circumferential groove is formed at the end of the male spline 24a, and a retaining ring 26 for preventing the shaft from falling off is attached to the circumferential groove.

  As shown in FIG. 1, an end plate 27 is attached to the opening 33 a on the anti-fixed type constant velocity universal joint side of the outer joint member 33 of the sliding type constant velocity universal joint 2. The end plate 27 includes a substrate 27a and a short cylindrical portion 27b extending from the outer peripheral edge of the substrate 27a to the inside of the joint. The short cylindrical portion of the end plate 27 is formed in the opening 33a of the outer joint member 33. 27b is fitted inside. A seal member 39a such as an O-ring is disposed between the inner diameter surface of the opening 33a of the outer joint member 33 and the short cylindrical portion 27b.

  A sealing device 28 is attached to the opening 33 b on the fixed type constant velocity universal joint side of the outer joint member 33. The sealing device 28 includes a metal adapter 29 and a boot 30 made of rubber or resin. That is, the metal adapter 29 has a main body cylinder portion 29a that is fitted and fixed to the other opening of the outer joint member 5, and a cylindrical shape that protrudes outward in the axial direction from the main body cylinder portion 29a via the stepped portion 29b. Boot mounting portion 29c.

  The boot 30 includes a large end 30a, a small end 30b, and a V-shaped or U-shaped folded portion 30c that connects the small end 30b and the large end 30a. And the small end part 30b of the boot 30 is externally fitted by the boot mounting part 25 of the shaft member 12B, and it fastens with the boot band 44 externally fitted by this small end part 30b. Further, the large end portion 30 a of the boot 30 is held by crimping the end portion of the boot mounting portion 29 c of the metal adapter 29.

  A seal member 39 b such as an O-ring is interposed between the inner surface of the main body cylinder portion 29 a of the adapter 29 and the outer diameter surface of the opening portion 33 b of the outer joint member 33. A retaining ring 40 is mounted on the inner diameter surface of the opening 33 b of the outer joint member 33. The retaining ring 40 prevents the internal part 41 composed of the inner joint member 36, the retainer 38, and the ball 37 as a torque transmission member from coming off from the outer joint member 33. A circumferential recess 42 is provided on the outer diameter surface of the outer joint member 33 on the opening 33b side, and the reduced diameter end 43 of the main body cylinder portion 29a of the metal adapter 29 is fitted in the circumferential recess 42. It is fixed.

  A grease inlet 45 is provided in the boot mounting portion 29 c of the metal adapter 29 of the sealing device 28. The grease inlet 45 is closed by a plug member (not shown) after the grease is injected into the joint. The plug member may be an embedding plug 62 as described later, or a tape material such as an adhesive tape.

  Next, an operation for incorporating the power transmission structure (propeller shaft) configured as described above into a vehicle will be described. First, as shown in FIG. 2, the shaft S is pushed into the sliding constant velocity universal joint, that is, the internal component 41 is pushed toward the joint back side (opening 33a side). The sliding constant velocity universal joint 2 is fastened to the mating flange 50 to be attached in a state where the overall length of the shaft is shortened. In this case, the amount of grease inside the joint can be reduced or not injected.

  A flange portion 46 is provided on the outer diameter portion of the opening 33 a of the outer joint member 33 of the sliding type constant velocity universal joint 2, and this flange portion 46 is in contact with the mating flange 50 to perform bolt-nut coupling. . That is, the flange portion 46 and the mating flange 50 of the outer joint member 33 are provided with through holes 46a and 50a. The bolt member 51 is inserted into the through holes 50a and 46a from the mating flange 50 side and protrudes from the flange portion 46. The nut member 52 is screwed onto the screw shaft of the bolt member 51. A plurality of such bolt / nut connections are arranged at a predetermined pitch along the circumferential direction.

  Thereafter, as shown in FIG. 3 from the state shown in FIG. 2, the shaft S is extended toward the mating flange 55 to which the fixed type constant velocity universal joint 1 is attached, and the end plate 17 is fitted into the fitting recess 55 b of the mating flange 55. Is in a state of fitting.

  Also in this case, the flange portion 56 is provided on the outer diameter portion of the opening 5 a of the outer joint member 5 of the fixed type constant velocity universal joint 1, and this flange portion 56 is in contact with the mating flange 55. Perform a bond. That is, the flange portion 56 and the mating flange 55 of the outer joint member 5 are provided with through holes 56a and 55a. The bolt member 57 is inserted into the through holes 55a and 56a from the mating flange 55 side and protrudes from the flange portion 56. The nut member 58 is screwed onto the screw shaft of the bolt member 57 that has been made. A plurality of such bolt / nut connections are arranged at a predetermined pitch along the circumferential direction.

  After being assembled in the vehicle as shown in FIG. 3, grease is injected into the joint from the grease injection port 45 (see FIG. 1) of the sliding type constant velocity universal joint, and then this grease injection port 45 is illustrated. Close with the omitted plug member. As a result, the assembling work into the vehicle is completed.

  In the present invention, the grease is injected into the inside of the joint through the grease injection port 45 in a state where the internal part 41 is slid to the joint opening side (opening 33b side) (assembled state). The amount of grease inside the joint can be reduced or not injected. Therefore, the grease flow resistance can be reduced or reduced when the internal part 41 is pushed into the joint back side ((opening 33a side) and when the internal part 41 is pulled out during the assembling work. Can be reduced.

  Therefore, in the sliding type constant velocity universal joint according to the present invention, the sliding resistance during the assembling work can be reduced, and this assembling workability can be improved. In addition, the edge on which the internal component 41 slides is not formed on the inner diameter surface 31 of the outer joint member 33, so that wear between the inner component 41 and the outer joint member 33 can be prevented, and the sliding type constant velocity freely excellent in durability. A joint can be constructed. Further, it is not necessary to provide a groove or the like on the inner diameter surface 31 of the outer joint member 33, so that an increase in the inner volume of the joint can be prevented, the amount of grease used can be minimized, and the cost can be reduced.

  Next, FIG. 4 shows a case where the grease inlet 45 is provided in the outer joint member 33. In this case, one opening 33 a of the outer joint member 33 is a large diameter portion 60, and the end plate 27 is disposed on the inner side of the large diameter portion 60. A retaining ring 61 is attached in the vicinity of the end plate 27. That is, the retaining ring 61 serves as a stopper that restricts the sliding of the internal component 41 toward the one opening.

  The other configuration of the sliding type constant velocity universal joint shown in FIG. 4 is the same as that of the sliding type constant velocity universal joint shown in FIG. Therefore, the same members as those in FIG. 1 are denoted by the same reference numerals as those in FIG. Also in this case, grease is injected into the joint from the grease injection port 45 of the sliding type constant velocity universal joint, and then, as shown in FIG. 5, the grease injection port 45 is closed with a plug 62 as a plug member. . As a result, the assembling work into the vehicle is completed. For this reason, since the sliding type constant velocity universal joint shown in FIG. 4 also has the grease injection port 45, the same operational effects as the sliding type constant velocity universal joint shown in FIG. 1 can be achieved.

  The sliding type constant velocity universal joint in the present invention is not limited to the double offset type described above, and even the cross groove type shown in FIGS. 6 and 7 is the tripod type shown in FIGS. Also good.

  The cross groove type constant velocity universal joint shown in FIGS. 6 and 7 alternately forms track grooves (ball grooves) 72 (72a, 72b) inclined in opposite directions with respect to the axis on the outer peripheral surface 71 in the circumferential direction. An inner joint member 73, an outer joint member 76 in which track grooves 75 (ball grooves) (75a, 75b) inclined in opposite directions with respect to the axis are alternately formed in the circumferential direction on the inner peripheral surface 74, A plurality of torque transmission balls 77 incorporated at the intersection of the track groove 72 of the inner joint member 73 and the track groove 75 of the outer joint member 76, the outer peripheral surface 71 of the inner joint member 73, and the inner of the outer joint member 76. And a cage 78 formed with pockets 81 interposed between the circumferential surface 74 and holding the torque transmitting balls 77 at predetermined intervals in the circumferential direction.

  In FIG. 7, β represents the crossing angle of each track groove 72a, 72b, 75a, 75b with respect to the axis. The torque transmission ball 77 is incorporated at the intersection of each track groove 72a, 72b, 75a, 75b.

  The shaft member 80 of the shaft S is inserted into the center hole (inner diameter hole) 79 of the inner joint member 73 and is spline-fitted, and torque transmission is possible between the two by the spline fitting. That is, a female spline 79 a is formed in the center hole 79 of the inner joint member 73, a male spline 80 a is formed in the shaft member 80 of the shaft S, and the shaft end portion of the shaft 80 is fitted into the center hole 79 of the inner joint member 73. Thus, the female spline 79a of the inner joint member 73 and the male spline 80a of the shaft member 80 are fitted. A retaining ring 90 is attached to the end of the male spline 80a of the shaft member 80 to prevent the shaft member 80 from coming off.

  An end plate 82 is fitted on one end side of the outer joint member 76 in the axial direction (opening portion on the opposite shaft protruding side), and the outer ring opening portion on the protruding shaft side is closed by a sealing device 83. The sealing device 83 includes a boot 85 made of rubber or resin and a metal adapter 84 made of metal.

  The boot 85 includes a small end portion 85b, a large end portion 85a, and a V-shaped or U-shaped folded portion 85c that connects the small end portion 85b and the large end portion 85a. The metal adapter 84 includes a cylindrical main body portion 84 c and a large-diameter cylindrical portion 84 a that is connected to the main body portion 84 c via a ring-shaped flat plate 84 b and is externally fitted to the outer joint member 76. . Further, the small end portion 85 b of the boot 85 is attached to the shaft member 80 of the shaft S and is fastened by the boot band 86. The large end portion 85 a of the boot 85 is held by crimping the end portion of the main body portion 84 c of the metal adapter 84.

  Further, the end plate 82 includes a cylindrical portion 82a that is externally fitted to the outer joint member 76, a deep dish-like member 82c that bulges to the opposite joint side, and a ring that continuously connects the cylindrical portion 82a and the deep dish-like member 82c. A flat plate 82b. A bolt member (not shown) is attached to the outer joint member 76, and the metal adapter 84 and the end plate 82 of the sealing device 83 are supported by the outer joint member 76 by the attachment of the bolt member. That is, the ring-shaped flat plate 82b of the end plate 82 and the ring-shaped flat plate 84b of the adapter 84 are provided with through holes 87 and 88, respectively, and the outer joint member 76 is provided with a through hole 89, and these through holes 87 and 88 are provided. And a bolt member is inserted in the through-hole 89.

  Even in such a cross groove type constant velocity universal joint, the grease injection port 45 is provided in the sealing device 83 and the outer joint member 76. In FIG. 6, the grease inlet 45 is provided in the metal adapter 84. For this reason, even if it is a cross groove type constant velocity universal joint, this effect can be show | played similarly to the double offset type constant velocity universal joint shown in FIG.

  The tripod type constant velocity universal joint shown in FIGS. 8 and 9 includes an outer joint member 91, a tripod member 92 as an inner joint member, and a roller 93 as a torque transmission member. The outer joint member 91 has a cup-shaped cup portion 95 opened at one end, and a shaft portion 96 protruding from the bottom wall 95a of the cup portion 95. The cup portion 95 is formed with a track groove 97 extending in the axial direction at a circumferentially equally divided position on the inner periphery thereof. The cup portion 95 has a non-cylindrical shape in which a large diameter portion 98a and a small diameter portion 98b appear alternately when viewed in cross section. That is, the cup portion 95 is formed with the large diameter portion 98a and the small diameter portion 98b, so that the three track grooves 97 extending in the axial direction are formed on the inner peripheral surface thereof.

  Roller guide surfaces (roller sliding contact surfaces) 97a, 97a are formed on the side walls of each track groove 97 facing each other in the circumferential direction. The inner diameter surface has a three-valve corollary shape in which small inner diameter portions 99b and large inner diameter portions 99a appearing alternately in the circumferential direction are connected by a roller guide surface 97a. That is, the outer joint member 91 is formed with three track grooves 97 including three roller guide surfaces 97a and 97a facing each other in the circumferential direction and a large inner diameter portion 99a provided between the two roller guide surfaces 97a and 97a. It is what is done.

  The tripod member 92 includes a boss 100 and a leg shaft 101. The boss 100 is formed with a spline hole 100a that is coupled to a shaft (not shown) so that torque can be transmitted. The leg shaft 101 protrudes in the radial direction from the circumferentially divided position of the boss 100.

  In this case, the roller 93 is fitted on the outer diameter surface of the leg shaft 101 via a plurality of needle rollers 102 disposed along the circumferential direction. The outer peripheral surface of the leg shaft 101 constitutes the inner rolling surface of the needle roller 102, and the inner peripheral surface of the roller 93 constitutes the outer rolling surface of the needle roller 102. That is, the tripod type constant velocity universal joint shown in FIGS. 8 and 9 is a single roller type. The plurality of needle rollers 102 are disposed between the outer peripheral surface of the leg shaft 101 and the inner peripheral surface of the roller 93 in a full roller state.

  These needle rollers 102 are in contact with the inner washer 103 externally fitted to the base portion of the leg shaft 101 in the radial direction, and are in contact with the outer washer 104 externally fitted to the tip portion of the leg shaft 101 in the radial direction outside. Yes. The outer washer 104 is prevented from coming off by fitting a retaining ring 106 such as a circular circlip into an annular groove 105 formed at the tip of the leg shaft 101.

  Even in such a tripod type constant velocity universal joint, the grease injection port 45 is provided in the outer joint member 91. For this reason, even if it is a tripod type constant velocity universal joint, this effect can be show | played similarly to the double offset type constant velocity universal joint shown in FIG.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. One grease injection port 45 is provided in the sealing device in FIG. In FIG. 4, one is provided on the outer joint member, but two or more may be provided on the sealing device, or two may be provided on the outer joint member. Further, the grease inlet 45 may be provided in the sealing device and the outer joint member. Furthermore, the size, shape, and the like of each grease injection port 45 can be set arbitrarily as long as grease can be injected and can be blocked by the plug member.

  In the propeller shaft shown in FIGS. 2 and 3, the fixed type constant velocity universal joint 1 is a bar field type in the above embodiment, but may be an undercut free type fixed type constant velocity universal joint. In addition, when a cross groove type constant velocity universal joint is used for the sliding type constant velocity universal joint 2, a cross groove type constant velocity universal joint called a float type in which the maximum outer diameter of the inner joint member is larger than the minimum inner diameter of the cage. It may be a cross-bulb type constant velocity universal joint called a non-float type in which the maximum outer diameter of the inner joint member is smaller than the minimum inner diameter of the cage. When a tripod type is used as the sliding type constant velocity universal joint 2, it may be a single roller type or a double roller type.

28 Sealing device 29 Metal adapter 30 Boot 31 Inner diameter surface 32 Track groove 33 Outer joint member 34 Outer diameter surface 35 Track groove 36 Inner joint member 37 Ball 38 Cage 38a Outer surface 38b Inner surface 41 Internal component 45 Grease inlet 62 Plug member 71 Outer peripheral surface 72 Track groove 73 Inner joint member 74 Inner peripheral surface 75 Track groove 76 Outer joint member 77 Torque transmission ball 78 Cage 83 Sealing device 84 Metal adapter 85 Boot 91 Outer joint member 92 Tripod member 93 Roller 97 Track groove

Claims (7)

An outer joint member; an inner joint member; and a torque transmission member interposed between the outer joint member and the inner joint member, wherein the inner part having the inner joint member and the torque transmission member is the outer part. A sliding type constant velocity universal joint that is accommodated in a joint member so as to be slidable in the axial direction, and is assembled with the internal part once slid to the joint back side and then the internal part slid to the joint opening side. Because
The outer joint member has a sealing device for sealing an opening, and grease is injected into the joint in a state where the internal part is slid to the joint opening side in at least one of the sealing device and the outer joint member. A sliding type constant velocity universal joint provided with a grease injection port.   The sealing device includes a metal adapter attached to the opening of the outer joint member and a flexible boot attached to the metal adapter, and the metal adapter is provided with a grease inlet. The sliding type constant velocity universal joint according to claim 1.   The sliding type constant velocity universal joint according to claim 1, wherein the grease injection port is provided in the outer joint member.   The sliding type constant velocity universal joint according to any one of claims 1 to 3, wherein the grease injection port is closed by a plug member.   The outer joint member has a track groove formed on the inner diameter surface, and the inner joint member has a track groove formed on the outer diameter surface, and is interposed between the track groove of the outer joint member and the track groove of the inner joint member. The torque transmitting member is a ball, and includes a cage having a pocket for accommodating the ball and interposed between the outer joint member and the inner joint member. 5. The double offset type in which the center of curvature of the peripheral surface is offset in the opposite direction to the axial direction with respect to the angular center of the joint. Sliding constant velocity universal joint.   The inner joint member alternately forms track grooves inclined in opposite directions with respect to the axis on the outer peripheral surface, and the outer joint member is a track inclined in opposite directions with respect to the axis on the inner peripheral surface. Torque transmission balls as the torque transmission member, wherein grooves are alternately formed in the circumferential direction, and incorporated in the intersections of the track groove of the inner joint member and the track groove of the outer joint member, respectively, and the inner It is a cross glove type provided with a cage having a window portion that is interposed between an outer peripheral surface of a joint member and an inner peripheral surface of the outer joint member and holds the torque transmission balls at a predetermined interval in the circumferential direction. The sliding type constant velocity universal joint according to any one of claims 1 to 4, wherein:   The outer joint member is formed with three track grooves having roller guide surfaces facing in the circumferential direction, and has a tripod member as the inner joint member having three leg shafts projecting in the radial direction; The sliding constant velocity according to any one of claims 1 to 4, characterized in that it is a tripod type including a roller as a torque transmission means that is externally fitted through a roller. Universal joint.

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